// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef NET_QUIC_CRYPTO_NULL_ENCRYPTER_H_
#define NET_QUIC_CRYPTO_NULL_ENCRYPTER_H_

#include <stddef.h>

#include "base/compiler_specific.h"
#include "base/macros.h"
#include "net/base/net_export.h"
#include "net/quic/crypto/quic_encrypter.h"

namespace net {

// A NullEncrypter is a QuicEncrypter used before a crypto negotiation
// has occurred.  It does not actually encrypt the payload, but does
// generate a MAC (fnv128) over both the payload and associated data.
class NET_EXPORT_PRIVATE NullEncrypter : public QuicEncrypter {
public:
    NullEncrypter();
    ~NullEncrypter() override { }

    // QuicEncrypter implementation
    bool SetKey(base::StringPiece key) override;
    bool SetNoncePrefix(base::StringPiece nonce_prefix) override;
    bool EncryptPacket(QuicPathId path_id,
        QuicPacketNumber packet_number,
        base::StringPiece associated_data,
        base::StringPiece plaintext,
        char* output,
        size_t* output_length,
        size_t max_output_length) override;
    size_t GetKeySize() const override;
    size_t GetNoncePrefixSize() const override;
    size_t GetMaxPlaintextSize(size_t ciphertext_size) const override;
    size_t GetCiphertextSize(size_t plaintext_size) const override;
    base::StringPiece GetKey() const override;
    base::StringPiece GetNoncePrefix() const override;

private:
    size_t GetHashLength() const;

    DISALLOW_COPY_AND_ASSIGN(NullEncrypter);
};

} // namespace net

#endif // NET_QUIC_CRYPTO_NULL_ENCRYPTER_H_
